Synonyms to border line

ceiling, CAT, acme, aerospace, aerosphere, air hole, air pocket, airspace, all, altitude, altitude peak, apogee, atmospheric visibility, automatic control, blast-off, bottom price, bound, boundary, boundary condition, boundary line, bourn, break boundary, breakoff point, bump, burn, burnout, business index, ceiling price, ceiling unlimited, circumscription, clarity, clearness, climax, compass, confine, conspicuity, conspicuousness, consumer price index, cost-of-living index, crosswind, crown, crystal-clearness, cutoff, cutoff point, deadline, definiteness, definition, delimitation, demand curve, descent, determinant, distinctness, division line, eaves, elevation, eminence, empty space, end, end of burning, evidence, evidentness, exaltation, extreme, extremity, favorable wind, finish, flight, floor, floor price, fog, front, frontier, hauteur, head wind, hedge, height, heighth, high visibility, high-pressure area, high-water mark, highest degree, highness, hole, housetop, ignition, impact, inflation, inflationary spiral, interface, ionosphere, jetstream, lantern, launch, lift-off, limen, limi